Turbocharger Tech Explained

The Garrett GTB1752VK turbocharger and its close relative the GTB1752VKL are small variable geometry turbos for four-cylinder diesels. In North America the one you are most likely to meet is the GTB1752VKL on the 2.8L Duramax in the Chevrolet Colorado and GMC Canyon. This guide covers what these turbos fit, which part number goes with

The Garrett GT3788VA turbocharger is the variable geometry unit bolted to every 2011–2016 6.6L Duramax LML, and if you turn wrenches on GM heavy-duty trucks you already know it’s the same GT3788VA family as the LLY, LBZ, and LMM units that came before it, but not the same part. GM revised the turbo, changed the

The Garrett GT3788VA is the variable-geometry turbocharger bolted to the back of every LBZ and LMM Duramax that rolled out of GM’s plants from 2006 through 2010. If you’ve got a 6.6L Duramax that’s lost top-end power, throws a P003A code, or surges because its vanes are not following commands, this is the unit you’re

The Holset HE531VE is the variable geometry turbocharger doing the heavy lifting on two of the most common Class 8 engines on the road today: the PACCAR MX-13 and the Detroit Diesel Series 60. If you run a fleet or wrench on big-bore diesels for a living, you’ve already seen these units come across the

The Holset HE400VG turbocharger is the backbone of boost management on the Cummins ISX15, and when it acts up, the whole truck feels it. Sluggish throttle response, active regens that never finish, derate codes flashing on the dash, and fuel mileage falling off a cliff. If you run or wrench on ISX-powered Class 8 trucks,

The Holset HX55 turbocharger is the workhorse boost unit bolted to millions of large displacement Cummins engines, and if you turn wrenches on ISM, M11, or QSM11 platforms you already know it by heart. This is the turbo that keeps 11-liter fleet trucks moving freight, and when it starts smoking, surging, or leaving power on